Why Do Darker Evenings Make Me Feel SAD?

Darker evenings can trigger seasonal affective disorder because shorter days and less daylight are thought to set off a chemical change in the brain, including a rise in melatonin, that leads to depression symptoms. Seasonal affective disorder, or SAD, is a real and recognized type of depression that most often appears in fall and winter. Millions of Americans experience SAD, and help is available.

Table of Contents

• What is seasonal affective disorder, and is it real?
• Why do darker evenings bring on SAD symptoms?
• What are the symptoms of seasonal affective disorder?
• When does seasonal affective disorder start, and who is more likely to experience it?
• What helps with seasonal affective disorder?
• Why do I feel more SAD in the evening?
• When should I reach out for help with seasonal affective disorder?
• Key Takeaways
• References

What is seasonal affective disorder, and is it real?

Yes, seasonal affective disorder is a real type of depression that follows seasonal patterns, most often fall or winter. According to the National Institute of Mental Health, SAD symptoms last about 4 to 5 months out of the year. It is estimated that millions of Americans experience SAD, and it is a recognized condition, not a personal failing or a sign of weakness.

Winter-pattern SAD is the most common form. Symptoms start in the late fall or early winter and go away during the spring and summer. A less common form, summer-pattern SAD, can bring symptoms during the longer, brighter days of summer. Winter-pattern SAD should not be confused with the "holiday blues," because the depression associated with SAD is related to changes in daylight hours, not the calendar, according to the National Institute of Mental Health.

Why do darker evenings bring on SAD symptoms?

Darker evenings bring on SAD symptoms because shorter days and less daylight are thought to set off a chemical change in the brain that leads to depression symptoms. The body naturally makes more melatonin when it is dark. So shorter, darker days result in more melatonin being made, according to Johns Hopkins Medicine. That extra melatonin can affect mood, sleep, and energy.

Some people notice symptoms during overcast stretches, regardless of the season. Evening darkness can feel like the hardest part of the day because the light has faded and the body is already signaling that it is time to wind down. Some evidence suggests that the farther you live from the equator, the more likely you are to develop SAD, according to Bassett Healthcare Network. That pattern fits the daylight explanation.

What are the symptoms of seasonal affective disorder?

The symptoms of seasonal affective disorder can include signs of depression such as low mood, low energy, and loss of interest in things that usually matter. These are signs to notice, not a diagnosis. Winter-pattern SAD can add other signs. According to the National Institute of Mental Health, winter-pattern SAD can include oversleeping, overeating with carbohydrate cravings, weight gain, and social withdrawal.

Summer-pattern SAD can look different. The National Institute of Mental Health notes that summer-pattern SAD can include trouble sleeping, poor appetite and weight loss, restlessness, anxiety, and agitation. SAD can also co-occur with anxiety. If any of these signs feel familiar, an assessment with a clinician can help clarify what is happening. No one should feel they have to label themselves alone.

When does seasonal affective disorder start, and who is more likely to experience it?

Winter-pattern seasonal affective disorder usually begins in late fall or early winter and fades in spring and summer. SAD usually develops between the ages of 18 and 30, according to Bassett Healthcare Network. The risk of SAD increases with age, and it is rare in people younger than age 20, according to Johns Hopkins Medicine.

Women are affected more often than men. Some estimates put the rate at about three times higher for women, according to Bassett Healthcare Network. SAD is also more common in people with depression or bipolar disorder, especially bipolar II disorder. SAD sometimes runs in families and may be more common in people who have relatives with other mental illnesses, according to the National Institute of Mental Health.

What helps with seasonal affective disorder?

Several approaches can help with seasonal affective disorder. Light therapy is one common option. Therapeutic lighting is much more intense than standard lighting and has been shown to decrease levels of melatonin in the brain, according to Bassett Healthcare Network. Talk therapy and medication evaluation are also common parts of a care plan. A clinician can help tailor a plan to fit a person's needs.

Practical daily habits can also make a difference. Getting outside in daylight, keeping regular sleep and meal times, and staying connected with people can all support mood during darker months. Solace Grove Behavioral Health offers Individual Therapy in person in Milwaukee and by telehealth across Wisconsin. Psychiatric Medication Management is also available, coordinated with therapy so the whole plan works together.

Why do I feel more SAD in the evening?

Many people notice their mood dipping as the light fades, and this is a common experience worth talking about. Evening worsening connects to the body's melatonin response to darkness. When it gets dark, the body makes more melatonin, according to Johns Hopkins Medicine. In fall and winter, that darkness arrives earlier and stays longer.

Less daytime light exposure can also disrupt sleep and energy. By evening, a person may feel the weight of a shorter daylight window. Some people notice symptoms during overcast stretches, regardless of season, according to Bassett Healthcare Network. Tracking when symptoms show up can help. Sharing that pattern with a clinician at an assessment can bring useful clarity.

When should I reach out for help with seasonal affective disorder?

Reaching out for help is worth considering when low mood, sleep changes, or withdrawal start affecting daily life, work, or relationships. A diagnosis of SAD requires depressive episodes to occur during specific seasons for at least 2 consecutive years, according to the National Institute of Mental Health. Only a clinician can assess whether that pattern is present.

Solace Grove provides outpatient care rather than 24-hour emergency services. For urgent needs, the 988 Suicide & Crisis Lifeline is available. For anyone who feels like the darker months are getting heavier, a conversation can be a gentle first step. Solace Grove Behavioral Health serves Milwaukee and all of Wisconsin, in person and by telehealth. Support is available at a pace that feels right.

Key Takeaways

• SAD is a type of depression that happens during certain seasons, most often fall or winter.
• Shorter days and less daylight are thought to set off a chemical change in the brain that leads to depression symptoms.
• The body makes more melatonin when it is dark, so darker days mean more melatonin.
• Winter-pattern SAD can bring oversleeping, carbohydrate cravings, weight gain, and social withdrawal.
• SAD usually develops between ages 18 and 30, and women are affected more often than men.
• Winter-pattern SAD is not the same as the "holiday blues," because it is tied to daylight hours, not the calendar.
• Solace Grove provides outpatient care, not 24-hour emergency services; the 988 Suicide & Crisis Lifeline is available for urgent needs.

References

1. Seasonal Affective Disorder - National Institute of Mental Health
2. Seasonal Affective Disorder - Johns Hopkins Medicine
3. Seasonal Affective Disorder: Less Light Can Mean Darker Moods - Bassett Healthcare Network